PSI- Issue 9

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 9 (2018) 272–278 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. © 2018 The Authors. P blished by Elsevier B.V. Peer-review und responsibility of the G uppo Italiano Frattura (IGF) ExCo. IGF Workshop “Fracture and Structural Integrity” Analysis of reinforced concrete slabs under blast loading Gianluca Iannitti a , Nicola Bonora a , Giuseppe Curiale b , Stefano De Muro b , Sonia Marfia a , Andrew Ruggiero a , Elio Sacco c , Sara Scafati b , Gabriel Testa a a Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via G. di Biasio 43, 03043, Cassino, Italy b Protezione Aziendale, Area Tecnica – Rete Ferroviaria Italiana S.p.A., Piazza della Croce Rossa 1, 00161 Italy c Department of Structures in Engineering and Architecture, University of Naples Federico II, Via Claudio 21, 80125, Naples, Italy Abstract Aim of the pres nt paper is the study of the blast effec s n reinf rced concrete slabs used for civil buildings. Reinforced concrete slab samples with and without partitions subjected to explosions are numerically analyzed adopting the explicit finite element code LS-DYNA. In particular, the explosive is considered in direct contact with the sample surface. Each material composing the slab is modeled adopting a suitable non linear constitutive model. The partitions are modelled as rigid bodies and they are placed in two different positions. Numerical analyses are performed on the slabs with and without partitions, considering the same amount of explosive, in order to determine the influence of partitions on the blast resistance of the slabs. Comparisons in terms of the damage produced in the slab are carried out. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Blast effects; Concrete slabs; Direct contact explosion; Partitions. 1. Introduction Recent terrorist attacks have pointed out that the public buildings are not safe places in case of explosion. Although the main cause of injuries against people are due to pressures and heat of the explosion, there are other threats that can be hazardous at the same manner. After an explosion, falling debris, breaking windows and, eventually, a partial or complete building collapse are further causes of injuries. With this in mind, to improve the blast resistance of buildings means to save lives. This can be achieved designing the right countermeasures expressly developed to mitigate the effects of blast loads on the buildings in order to reduce the collateral effects of the explosion. Unfortunately, there are no standards that can give the guideline to improve the blast resistance of buildings, but this can be done through experimental and numerical analysis. IGF Workshop “Fracture and Structural Integrity” Analysis of reinforced concrete slabs under blast loading Gianluca Iannitti a , Nicola Bonora a , Giuseppe Curiale b , Stefano De Muro b , Sonia Marfia a , Andrew Ruggier a , Elio Sacco c , Sara Scafati b , Gabriel Testa a a Department of Civ l and M ch nical Engineering, University of C ssino and Southern L zio, via G. di Bia io 43, 03043, Cassino, Italy b Protezione Aziendale, Ar a Tecnica – Rete Fer oviar a Italiana S.p.A., Piazza della Croce Rossa 0 61 Italy c Department of Structures in Engineering and Architecture, University of Naples Federico II, Via Claudio 21, 80125, Naples, Italy Abstract Aim of the present paper is the study of the blast effects on reinf ced concrete slabs use for civil buildings. Reinforc d con ret slab samples with and without partitions ubjected to explosions are numerically nalyzed adopting t e expl cit finite element code LS-DYNA. In articular, the explosive is considered in irect contact with th sampl surface. Each m terial composing the slab is modeled adopting a suitable non lin ar constitutiv m del. The partitions are modelled as rigid b dies and they are placed in two different positions. Num ical analyses are performed on the sla s with and without partitions, considering he same amount of explosive, in order to d termine the influence of partitions on the blast resistance of the slabs. Comparisons in terms of the damage produced in the slab are carried out. © 2018 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Blast effects; Concrete slabs; Direct contact explosion; Partitions. 1. Introduction Recent terrorist attacks have pointed out that the ublic buildings are not safe places in case of explosion. Although the main cause of injuries against people are due to pressures and heat of the explosion, there are other thre ts that can be hazardous at the same manner. After an explosion, falling debris, breaking windows and, eventually, a partial or complete building collapse are further causes of injuries. With this in mind, to improve the blast resistance of buildings means to save lives. This can be achieved designing the right count rmeasures expressly developed to mitigate th effects of blast loads on the buildings in order to reduce the collateral eff cts of the explosion. Unfortunately, there are no standards that can give the guideline to improve the blast resistance of buildings, but this can be done through experimental and numerical analysis. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2018.06.035 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2018 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.